studentsonline.dk is a .dk domain served by 2 nameservers (hank.ns.cloudflare.com, olga.ns.cloudflare.com). It was registered on 26 August 2020 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.15.17 is hosted by Cloudflare, Inc. (AS13335). The zone is not DNSSEC-signed, has no DMARC policy and is reachable over IPv6. Below are all of its DNS records from this scan: nameservers, A/AAAA, MX, TXT, SPF, DMARC, CAA, TLSA/DANE, MTA-STS, SRV and more.
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 104.21.15.17 | — | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.161.5 | — | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3030::ac43:a105 | — | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3034::6815:f11 | — | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.15.17,172.67.161.5 ech=AEX+DQBBNAAgACDAjIMLMdyoyKrz46qSONFPzN+RU0NXjPG5OscOQ8iLfgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::ac43:a105,2606:4700:3034::6815:f11 |
| TXT Record |
|---|
| v=spf1 ip4:77.233.252.243 ip4:77.233.252.244 ip4:77.233.252.245 ip4:77.233.252.248 ip4:83.89.199.62 ip4:62.243.73.0/24 ip4:77.32.175.81 ip4:212.27.13.241 include:spf.protection.outlook.com include:spf.webcrm.com include:spf.sendinblue.com mx -all |
| Policy | Record (studentsonline.dk) |
|---|---|
| -all (hard fail) | v=spf1 ip4:77.233.252.243 ip4:77.233.252.244 ip4:77.233.252.245 ip4:77.233.252.248 ip4:83.89.199.62 ip4:62.243.73.0/24 ip4:77.32.175.81 ip4:212.27.13.241 include:spf.protection.outlook.com include:spf.webcrm.com include:spf.sendinblue.com mx -all |
| www | 104.21.15.17 172.67.161.5 2606:4700:3035::6815:f11 2606:4700:3036::ac43:a105 (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network studentsonline.dk: 104.21.15.17 172.67.161.5 2606:4700:3035::6815:f11 2606:4700:3036::ac43:a105 (AS13335) www.studentsonline.dk: 104.21.15.17 172.67.161.5 2606:4700:3035::6815:f11 2606:4700:3036::ac43:a105 (AS13335) |
| Wildcard | No |
DNS lookups: 5/10 · policy: -all
No problems found| Check | Result |
|---|---|
| Validation Status | 🔓 Insecure |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✗ Not found |
| Flags | unsigned answer |
| Field | Value |
|---|---|
| Serial | 2406707960 |
| Primary NS (MNAME) | hank.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2020-08-26 |
| Expires | 2027-08-31 (316d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-07 04:51:59 | 464ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-10-03 02:31:43 | 809ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-10-01 02:18:49 | 449ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-25 07:47:36 | 563ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-03 21:04:02 | 9461ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-08-25 12:37:57 | 995ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-08-09 16:26:20 | 922ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-08-07 03:44:05 | 1157ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-07-31 20:18:36 | 16689ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-28 02:39:59 | 1201ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-24 04:34:10 | 943ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-21 10:29:24 | 1210ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-20 03:17:38 | 879ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-19 22:20:15 | 4345ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-17 14:04:38 shown | 2306ms | 2 NS 2 A 0 MX | 🔓 Insecure |